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5x = 54 |:5
x = 10,8
6x = 12 |:6
x = 2
50x = 190 - 90
50x = 100 |:50
x = 2
5x = 54
x = 10.8
6x = 12
x = 2
50x + 90 = 190
50x = 100
x = 2